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Web's Hot New Commodity: Privacy

As the surreptitious tracking of Internet users becomes more aggressive and widespread, tiny start-ups and technology giants alike are pushing a new product: privacy.

Companies including Microsoft Corp., McAfee Inc.—and even some online-tracking companies themselves—are rolling out new ways to protect users from having their movements monitored online. Some are going further and starting to pay people a commission every time their personal details are used by marketing companies.

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